🔧 ci: add build source code workflow

Author: retrozinndev

.github/workflows/build_source_code.yml

@@ -0,0 +1,42 @@
+name: Build source with Gradle
+
+permissions:
+  contents: read
+
+on:
+  push:
+    branches: [ "main" ]
+    paths: ["src/"]
+  pull_request:
+    branches: [ "main" ]
+    paths: ["src/"]
+  workflow_dispatch:
+  
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - name: Set up Temurin OpenJDK 8
+      uses: actions/setup-java@v4
+      with:
+        java-version: '8'
+        distribution: 'temurin'
+    
+    - name: Set up Gradle 8.5
+      uses: gradle/gradle-build-action@v2.11.1
+      id: setup-gradle
+
+    - name: Checkout
+      uses: actions/checkout@v4
+    
+    - name: Build with Gradle
+      uses: gradle/gradle-build-action@v2.11.1
+      with:
+        arguments: --info jar
+
+    - name: Upload artifact
+      uses: actions/upload-artifact@v4.2.0
+      with:
+        name: Build-jar
+        path: build/libs/TheTraveler.jar